#include <string.h>
#include <stdlib.h>

char *strndup(const char *s, size_t n)
{
	size_t len = strnlen(s, n) + 1;
	char *copy = malloc(len);

	if(copy) {
		memcpy(copy, s, len);
		copy[len - 1] = 0;
	}

	return copy;
}